Dental apparatus



June 8l, 1926.

S. A. GUTTERIDGE DENTAL APPARATUS Filed May 26. 1925 2 Sheets-Shet l June 8 19.26.

S. A. GUTTERIDGE A .DENTALAPPARATUS Filed May 26, 1925 f 2 Sheets-Sheet 2 Patented June v8, 1926.

UNITED STATES PATENT OFFICE. l

SAMUEL ALBERT GUTTEBIDGE, F LONDON, ENGLAND, ASSIGNOR T0 THE IAMALGA- HATED DENTAL COMPANY LIMITED, 0F LON DON, ENGLAND, A BRITISH COMPANY.

DENTAL APPARATUS.

Application led May 26, 1925, Serial No.

This invention consists in improvements in or rel-ating to dental apparatus and has reference to that type ofapparatus employed in charging flasks with rubber or like material from which an artificial denture is to be prepared. In charging flasks by injection under pressure, it is necessary that the rubber or rubber composition or the material used for the denture, be heated sufficiently to bring it into a plastic or semi-fluid condition in which it can be forced into the mould-cavity in the iask so as to fill that cavity. Not only must the charging cylinder in such a device be maintained in a heated condition, but it is also necessary to heat the flask itself during theprocess.

According to the present invention, charg lng apparatus for the above purpose com prises in combination a heating container,

2O a jacketing wall wholly or mainly surrounding it, a jacketing passage extending through adjacent container and jacket walls for thev reception of a charging cylinder, and means permitting communication between the interiors of the jacket for the said passage and that surrounding the container. Thus, heating fluid in the jacket surrounding the container can pass into the jacketed passage so that both the interior of the charging cylinder and the interior of the container can be maintained at the required temperature.

Preferably a conduit is led to the interior of the container from the jacket-space surrounding it, so that if required, steam or heating fluid from the jacket-space can be passed into the interior of the container to increase the temperature therein.

In a preferred construction of apparatus, a charging cylinder has a. charging plunger 40 to co-operate therewith, and the plunger is carried in a bracket whichl is so operatively connected with the charging cylinder `that end pressure exerted by the plunger is not applied directly to the Walls of the container or its jacket. Conveniently the bracket is secured, b means of a pivotal connection,

to the jac etof the passageway which re` eeives the charging cylinder, the pivotal axis being transverse to the throughway length of the passageway. Thus, when the plunger is retracted so asto be clear of the cylinder" it can be swun round to one side while supported in the racket.

32,958, and in Great Britain June 1'1. 1924.

In order that the invention may be more clearly understood, one construction of apparatus will now be described by way of example only with the aid of the accom-y panying drawing in -which Figure 1 is a central sectional elevation other metal and is enclosed in a jacket 11 l so that the container is suspended from the top of the jacket and has a clear water space beneath it and round its lateral walls.

Passing through the wallsI of both the I containerl and the jacket is a sleeve 12 formed with perforations 13 which communicate with the space between the jacket andthe container. Mounted -on the end of the sleeve 12 to swing about the pivots 14 is a bracket 15 in which a charging plunger 16 is carried. The charging plunger is rotatably mounted on the end of a screw 17 which is threaded through a boss on the bracket 15.

The sleeve 12 is provided with a liner 18 so as to provide a tubular water jacket within which acharging cylinder 19 is slidingly received. The liner 18 maybe brazed or otherwise secured to the sleeve 12` and thel latter is made a fluid-tight {it with the walls ot' the jacket 1l and the container 10 by brazing, sweating or other lpreferred means. A split ring 20, received in a groove in the sleeve 12, aii'ords a stop to engage a shoulder 21 formed as an extension of the container 1() to resist the pressure tending to withdrawflhe sleeve 12 to the right of Figure 1 during the charging operation. The split ring 20 thus reinforces the means by which the sleeve is secured to the wall of the container 10.

It will beseen that the end pressure exerted by the plunger during the Xcharging operation is exerted primarily on"the pivctal'connection between the bracket 15 and the sleeve 12 and such pressure as is exerted on the wall of the container 10 is distributed over the area of connection between the 4sleeve 12 and that wall. It will also be seen that by provision of the pivotal connection of the bracket the latter, with the plunger, can be swung round to one side so as to leave the entrance Ato the charging cylinder 19 quite clear.

Extending through the container and the jacket walls at a position diametrically opposed to the charging cylinder is an adjustable, back stop 22 in the form of a threaded rod which is engaged with a screw-threaded inner end of a sleeve 23. The sleeve passes right through both the jacket and container walls and its joints with those walls are made Huid-tight in a manner similar to that in which the sleeve 12 is also made Huidtight with those walls. Also a split ring 24 is provided to serve a similar purpose to that of the split ring 20, above described.

A flask 25, in which the mould cavity and teeth are indicated, is shown in the position which itwill occupy during the charging operation. The outlet nozzle of the charging cylinder 19 is sho-wn in engagement with the inlet to the flask which latter may be constructed conveniently in the manner de-l scribed in co-pending application Serial No. 32,957, filed May 26, 1925. The back stop 22 is then screwed up to hold the inlet opening of the flask tight up against the outlet `nozzle ofthe charging cylinder and the latter is prevented from movement byset screws 36 which pass' through a Harige (forming part of the charging cylinder) n and which screw into the end lof the sleeve 12.

Assuming that a wax model has been invested in plaster in the flask 25 and the wax has been removed in any preferred manner the mould thus provided is inV communication with the inlet opening in the flask. Water contained in'the/jacketed space surrounding the containerr 10 is heated up by means of a burner placed beneath the jacket; the bracket 15 is swun aside and a charge of rubber is' inserted in p the charging cylinder 19 and the bracket is thereafter swung back ,so that the plunger inay be screwed sol of a slide '26 such as is described in the copending application above referred to.

,i Qlid 27 can be used to close the open end of the container 10.

If it is desired to heat the flask more in- A safety valve 31 is conveniently provided and inthe cap 32 which normally closes the filling opening for the jacket 11 there is preferably provided also a second safety -valve 33.

To the jacket .1L- there may be secured legs 34; or the latter may be secured to a ring 35 forming .a support on which the jacket 11 may rest. The height of the legs 34 is chosen to conform to the particular heating appliance which is to be used.

The sleeve 12 with its liner 18, bracket 15, plunger 16, and rod 17 are formed as a Separate unit apart from the container 10 and jacket l1 and the invention includes such a unit for use in apparatus of the type described herein.

The invention is not limited to the particular constructional details described as these may be varied without departing from the invention.

I claim 1. Charging appar tus for the purpose described comprisingn combination a heating container, a jacketing wall for the same, and a jacketed passage extending through adjacent container and jacket walls for the Ireception of a charging cylinder, the interior of the jacket of which passa'ge is in openv communication with the interior of.

the jacket of said container, substantially as described. `v

2. Charging apparatus for the purpose described comprising in combination a heating container, a jacketing wall for the same, a jacketed passage extending throu h adjacent container and jacket' walls or the Ireception of a charging cylinder, the interior of the jacket of which passage is in open communication with the interior of the jacket of saidcontainer, and a conduit con-.

nectin'g the jacket space of the container `with the interior of the ycontainer for c011- veying'v heated fluid fromr the container jacket into. the container, substantially as described.'

3. Charging apparatus for Athe purpose described'comprising in combination a heating container, a jacketing wall for the same, a jaeketed passage extending through adjacent container and jacket walls, av charging cylinder in said passa'ge, a charging' plunger for co-operating with said cylinder,

and a bracket in which said plunger is` mounted, which bracket is so operatively engaged with the4 charging cylinder that the walls of the container and its bracket are reiieved of end .pressure applied by the plunger to the cylinder, substantially as described.

4. Charging apparatus for the purpose described comprising in combination a heating container, a jacketing wall for the same, and a jacketed passa e extending through adjacent containerl an' 'acket walls, the interior of the'jacket o which passage is in open communication with the interior of the-jacket of said container, a charging cylinder in said passage, a charging plunger for co-operating with said cyhnder, an a bracket that is mounted on the jacket of said passage and vcarries' said plunger, substantxally as described. y

5. In charging apparatus of the kind described, an umtary structure com rising the combination of a jacketed hol er for use with a jacketed heating container a chargin'g e hnder carried in said holder, a lunger or-the charging cylinder, and a de bracket that carnes said plunger and 1s mounted on said ci'acketed older, substantially as describe In testimony whereof I vaiix my signature. i

SAMUEL ALBERT GUTTERIDGE. 

